Adhesive sheet

Inactive Publication Date: 2006-04-20
AGWEST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0023] Yet another object of the invention is to allow for easier removal of adhesive film after it has been adhered to an adherent article.
[0024] Yet another object of the inve

Problems solved by technology

Another limitation of films with porous substrate is that when a coating or an ink for decoration is applied to the second, non-adhesive face of the substrate, it tends to close the pores of the porous substrate and initial performance cannot be obtained.
This condition is particularly problematic when a coating with sealing properties is highly desirable as the means for protecting the non-adhesive surface of the adhesive film from dust, dirt, moisture, liquids, or human touch, or when such a coating is used to improve the performance, prepare the surface for printing, or protect the print ink.
Furthermore, many desirable substrate materials including plastics and metals are not naturally porous and permeable by air.
Hence, the usefulness of permeable substrate of prior art for construction of adhesive films is very re

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example

EXAMPLE 1

[0051] Table 1 shows theoretical predictions of air flow through smooth holes with diameters of 10, 32, and 100 micrometers installed in a 75 micrometer thick sheet impervious to air and operated with a pressure differential of 1.2 kilo Pascals (4.9 inches of water). (Note that this is the same pressure differential normally used in the Gurley tester.) This data is based on theoretical predictions found in “Effect of Pinholes on Sterile Barrier Properties,” by Earl T. Hackett, Jr. presented at the HealthPak Conference, St. Petersburg, Fla., in March 2001. TABLE 1Hole Diameter [micrometers]10 μm32 μm100 μmFlow velocity [cm / sec]40035005500Flowrate per hole [cubic0.0003140.0280.039cm / sec]Porosity produced by 1 hole3180003571256per inch square [Gurleyseconds]Areal density of holes3,180362.6necessary to produce poro-sity of 100 Gurley seconds[per square inch]

Example

EXAMPLE 2

[0052] Table 2 shows several suitable choices of diameter and areal density for microscopic holes suitable to relieve 1 cubic centimeter air bubble to atmosphere in less 5 seconds assuming a constant pressure differential of 1.2 kilo Pascals. Sheet thickness is 75 micrometers. Expectedly, the data shows that smaller holes must be applied with greater areal density to meet the specified venting time during installation of adhesive film to an article. Note that even for a 10 micrometer diameter hole the required areal density of 1,000 to 10,000 holes per square inch is realistic and technically attainable. TABLE 2Time (seconds) required torelieve 1 cubic centimeter airAreal density of microscopicbubble for hole diametersholes [per square inch]10 μm32 μm100 μm12.6103.60.261000.361,0003.210,0000.32

[0053] As already noted, after the film is applied to the article surface and trapped air bubbles are avoided, gas evolution can still occur at the bond interface when the film is e...

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Abstract

An adhesive sheet is disclosed including a flexible substrate and an adhesive layer formed on at least one of the main surfaces of the flexible substrate. The adhesive sheet further includes a plurality of microscopic holes connecting the opposing surfaces of the sheet and being generally perpendicular to them. Such adhesive sheet is permeable by air and allows good bubble escapability when the sheet is applied to an article. Sufficient permeability of the sheet to air is achieved with microscopic size holes installed in modest areal densities, hence the appearance and functionality of the film surface are not significantly adversely impacted. One intended use of the subject invention is for tinting films used to reduce light transmission in windows for use in buildings and automobiles. In this application visual appearance of the film is paramount. Another intended application of the subject invention is for antireflective film which is applied to electronic computer displays (flat panel, cathode ray tube) to reduce unwanted ambient light reflection and to improve contrast.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] Not Applicable FEDERALLY SPONSORED RESEARCH [0002] Not Applicable SEQUENCE LISTING OR PROGRAM [0003] Not Applicable FIELD OF THE INVENTION [0004] The present invention relates to an adhesive film in a form of a sheet, strip, tape, label, tag, and the like which is perforated with microscopic holes to provide good air bubble escapability while maintaining good appearance and functionality of the film surface after being adhered to an article. BACKGROUND OF THE INVENTION [0005] Various types of adhesive films comprising a flexible substrate and an adhesive layer have been heretofore available. Such films are provided in the form of sheets, tapes, strips, labels, tags, and the like. Those films having a pressure sensitive adhesive layer generally are mounted on some type of release liner or other releasable support to protect the pressure sensitive adhesive until the film is ready to be applied to an intended article. The film is then stri...

Claims

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Application Information

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IPC IPC(8): B32B3/10
CPCC09J7/026Y10T428/15C09J2201/20C09J2201/28B29L2031/744B29C2049/2425B29C2049/2433B32B37/003B32B37/1292B32B38/145B29C63/0047B32B2038/047B32B2307/724B32B2457/20B29L2031/3475Y10T428/24802Y10T428/2495Y10T428/24331Y10T428/14Y10T428/24322Y10T428/1486Y10T428/24273C09J2201/128C09J7/22Y10T428/249978Y10T428/24998C09J2301/18C09J2301/204C09J2301/124
Inventor VETROVEC, JANVETROVEC, KATERINA
Owner AGWEST
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